/*
 * ProGuard -- shrinking, optimization, obfuscation, and preverification of Java bytecode.
 *
 * Copyright (c) 2002-2018 GuardSquare NV
 *
 * This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public
 * License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later
 * version.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied
 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along with this program; if not, write to the Free
 * Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */
package proguard.io;

import java.io.*;

import static proguard.classfile.ClassConstants.CLASS_FILE_EXTENSION;
import static proguard.classfile.util.ClassUtil.internalClassName;

/**
 * DataEntry implementation which loads an input stream from the classpath of the running VM.
 *
 * @author Johan Leys
 */
public class ClassPathDataEntry implements DataEntry {
    private final String name;

    private InputStream inputStream;

    /**
     * Creas an new ClassPathDataEntry for the given class.
     *
     * @param clazz the class for which to create a data entry.
     */
    public ClassPathDataEntry(Class clazz) {
        this(internalClassName(clazz.getName()) + CLASS_FILE_EXTENSION);
    }

    /**
     * Creates a new ClassPathDataEntry for the entry with the given name.
     *
     * @param name the name of the class for which to create a data entry.
     */
    public ClassPathDataEntry(String name) {
        this.name = name;
    }

    // Implementations for DataEntry.

    public String getName() {
        return name;
    }

    public String getOriginalName() {
        return name;
    }

    public long getSize() {
        return -1;
    }

    public boolean isDirectory() {
        return false;
    }

    public InputStream getInputStream() throws IOException {
        if (inputStream == null) {
            inputStream = getClass().getClassLoader().getResourceAsStream(name);
        }
        return inputStream;
    }

    public void closeInputStream() throws IOException {
        inputStream.close();
        inputStream = null;
    }

    public DataEntry getParent() {
        return null;
    }

    // Implementations for Object.

    public String toString() {
        return getName();
    }
}
